Electrical element



March 11, 1930. H. D. RALSTON 1,750,492

ELECTRICAL ELEMENT Filed May 28. 1928 ATTORNEY Patented Mar. 11, 1930UNITED STATES T OFFICE HURLEY D. RALSTON, OF OAK PARK, ILLINOIS,ASSIG-NOB OF FORTY PER CENT TO ROBERT J". BLUIW, OF RIVER- FOR-EST,ILLINOIS I ELECTRICAL ELEMENT Application filed. May 28,

This invention relates to certain novel improvements in electricalelements of the type adapted to produce heat or light and has for itsprincipal object the provision of an improved construction of thischaracter which will be highly eflicient in use and economical inmanufacture.

It is among the objects of my invention to provide a device of the abovementioned type which will be arranged so as to embody a very high degreeof efficiency.

A still further object of the invention is to arrange the device in sucha manner that the radiation therefrom shall be increased and be directedin but a single direction while radiation in other directions will beprevented by an insulating section formed as part of the device.

Other objects will appear hereinafter.

- The invention consists in the novel combination and arrangement ofparts to be hereinafter described and claimed.

The invention will be best understood by reference to the accompanyingdrawings, showing the preferred form of construction and in which:

Fig. 1 is a side elevational view of a preferred form of constructionfor my invention; and

Fig. 2 is a vertical sectional view of the de vice as illustrated inFig. 1.

In the drawing wherein the preferred embodiment of my invention isillustrated 10 indicates a base which in the present instance comprisesa shell member 11 that is filled with a suitable insulating materialindicated by 12. In the present instance the shell member 11 is arrangedso as to embody screw threads 13 so as to facilitate the mounting of thedevice in an electric socket but it is to be understood that the screwthreads 13 might be displaced 1928. Serial No. 281,277.

inset substantially bowl shaped portion 17. It will thus be seen thatthe portions 16 and 17 and the upper side of the base 10 co-operate toprovide a closed chamber 18 from which air is preferablywithdrawn inorder to create .55 a vacuum therein. If desired the chamber 18 may befilled with a suitable insulating material and it is therefore apparentthat the area defined by the portion 17 may be surrounded by aneiiective insulation except on the open 6.0 side thereof. The portion 17is preferably formed to be substantially spherical, or if desiredparabolical in shape. It will thus be seen that the portion 17 providesa substantially bowl shaped arrangement that embodies an open upper sideand which includes a portion that is inset from this open upper side.

Mounted in the bowl shaped portion defined by the portion 17 at thepoint which is inset from the open upper side in the greatest amount Imount a heating element 19. It is to be understood that a. lightingelement might be substituted for this heating element or any otherdesired electrical mecha-- nism. In the present instance I show theconductors 20 and 21, adapted to supply elec tric current to the element19, as being directed through the chamber 18 and connected in the mannerwell understood in the art to 8 the base member 10, the conductor 20being connected to the shell member 11 while the conductor 21 isconnected to the end portion '22 that is insulated from the shell member'11 as indicated at 23 in the drawing. It is' to be understood, however,that the conductors 20 and 21 might be directed around the of myinvention.

In operation, current is supplied to the element 19 so asto cause raysto be emitted therefrom. These rays will pass out through the open upperside of the portion 17 being so directed by the shape of the portion 17.In order to facilitate this directing of rays from the element 19 theparabolically shaped portion 17 might have the surface thereof, disposedtoward the element 19, coated as by so-called silvering or otherwisearranged so as to facilitate the directing of the rays. Since the rayswill all be guided so as to pass in one direction as set forthheretofore it is apparent that the efficiency of the device will begreatly increased and therefore a greater nt of h at or lig wi be em t dr m the open side of the portion 17 than would be directed in a givendirection if the element 19 were not so mounted;

While I have "illustrated and described the preferred form ofconstruction for carrying my invention into effect, this is Q tPa-ble ofvariation and modification, without departing from the spirit of theinvention. 1,

therefore, do not wish to be limited to the precise details ofconstruction set forth, but desire to avail myself of such variation andmodifications as come within the scope of the appended claims.

20 .Having thus described my invention what 'I' claim is new and desireto protect by Letters Patent is r 1. A device of the character statedincluding a substantially bowl-shaped portion haves ing anotherbowlrshaped portion fitted into the open side thereof, a base member,means for connecting the base member to said first named portion wherebyan air tight chamber may be defined between said portions,-an electrioelement mounted in said second named portion at the inward-most disposedsection thereof, and means for connecting said element to electriccontact portions on said base member, said base member having connect-.3.5 ing portions provided thereon to permit the irliauntingthereof inan electricsocket or the e.

2. YA device of the'character stated includ ing a substantiallybowlsshaped portion hav- =40 ing another bowl-shaped portion fitted intothe open side thereof, a base member, means for connecting the basemember to said first namedportion whereby an air tight chamber may hedefined between said portions, an electrio-element mounted in saidsecond named portion at the inwardrmost disposed section thereof, saidbase member having screw threads provided on the periphery "thereof, anelectrical conductive shell mounted over if) said base member congruentto the screw threads thereon, an electric contact mounted on said (basemember and insulated .fromsaid shell, and means for connecting saidelement to said shell member and said electric contact. V

In testimony whereof I affix my signature.

HURLEY D, RALSTQN.

